Arc-light electrode.



E. R. BERRY. ARC LIGHT ELECTRODE. A PPLIOATIOK mum we. a, 1909.

ate' mq Fb. 13, 1912,

Witnesses:

' which the following is a EDWARD BERRY,

OFJJNN, MASSACHUSETTS, COMPANY, A CORPORATION OF NEW YORK.

ASSIGNOR TO GENERAL ELECTRIC ABC-LIGHT ELECTRODE.

Specification of Letters Patent.

Patented Feb. 13, 1912.

To all whom it may concern:

Be it known that I, Enwxnn R. BERRY, a citizen of the United States,residing at Lynn, county of Essex, State of Massachusetts, have inventedcertain new an useful Im rovements in Arc-Light Electrodes, of

specification.

My invention has reference to improvements in are light electrodes andis particularly applicab e to an electrode made of titanium carbidmixture or containing a pre onderating amount of titanium carbid; an myinvention has for its aim the increase of the life of titanium carbidelectrodes byincorporatin in the body thereof a, small percentage of cromium carbid.

My. inventionis based upon the discovery that whereas the addition ofchromite or any other oxid,of chromium to an elect-rode material that iswholly or largely composed of an oxid or oxids of metal, acts as arestrainer to the consumption of such electrode,-the addition of suchoxid of chromium to an electrode material which is largely orpreponderatingly composed of a material that is not an oxid of a metal,actually shortens the life of the same to a considerable extent; andthat, 'on the other hand, the life of an electrode which is largely orwholly composed of a material that is not an oxid of a metal or metals,is lengthened by the addition thereto of nonoxidized chromium orchromium compound.

In the accompanying drawingI have illustrated in vertical section anelectrode embodying my invention. In this drawing, 1 represents a metal"shell or tube usually made of iron and 2 is a plug of any suitablematerial by which the lower. end of the tube is closed. This tube has afilling 3 of the ordinary titanium carbid mixture, with the addition ofa small percentagcof chromium carbid. The addition to the titaniumcarbid mixture of even a small amount of chromium carbid quitenoticeably increases the life of the electrode, and an increased amountof Application fled August 0, 1809. Serial No. 511,520.

up to five per cent., still further increases the life of the electrodewithout diminishing the candle power of the arc; in fact, with theaddition of chromium carbid, up' to five per cent, a slight increase ofcandle power is observed. A further increase of the percentage ofchromium carbid, while still further increasing the life of theelectrode, is accompanied by a slight decrease in the candle ower. Ihave obtained the best results y using ninety-five and one-half percent. of titanium carbid mixture and fou'r and one-half per cent. ofchromium carbid. While these proortions give the best results, I am notlimitcd to the same, since theaddition of chrochromium carbid,

mium carbid in any amount to the titamurn carbid increases the life ofthe electrode although a loss of light is experienced with the higherpercentages.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is 1. An arc light electrode, containing a preponderating amountof titanium carbi and an admixture of chromium carbid..

2. A titanium carbid electrode, having distributed through its mass asmall percentage of chromium carbid as a restrainer.

3. An are light electrode material consisting of a titanium carbidmixtiirmand about one-half to five per cent. of chromium carbid. 4. Anarc lig t electrode material consisting of ninety-five and one-half percent. of

titanium carbid mixture half per cent. of chromium carbid.

and four and one 5. An arc-light electrode containing a preponderatingamount of non-oxidized titanium compound, and an admixture ofnonoxidized chromium compound.

In witness whereof, I have hereunto set my'hand this fourth day ofAugust, 1909.

EDWARD R. BERRY.

\Vitnesses:

JOHN A. MCMANUS, Jr., CHARLES A. BARNnRo,

